Get rid of old style process chain within code

[mmacata]

Old style, e.g.

{'1': {'module': 'exporter', 'interface-description': True}}

is still used a lot within actinia-core code itself. To be able to drop support for old style, this needs to be adjusted. See also https://github.com/mundialis/actinia_core/issues/227

When all is changed, drop support for old style.